Impact water turbine

Abstract

The utility model provides an impulse water turbine, relates to the technical field of water conservancy and hydropower engineering, and is used for solving the problem that the single-machine capacity of the impulse water turbine in the related technology is small. The impulse turbine comprises: a housing having an inner cavity; the rotating wheel assembly is arranged in the inner cavity and comprises a main shaft and a plurality of rotating wheels arranged on the periphery of the main shaft in a sleeving mode, the main shaft is used for being connected with a generator, and the rotating wheels are arranged at intervals in the axial direction of the main shaft; the water distribution assembly comprises a plurality of water distribution pipes corresponding to the rotating wheel, the first ends of the water distribution pipes communicate with the water supply end, the second ends of the water distribution pipes are located in the inner cavity and surround the outer side of the rotating wheel, and the water distribution pipes are provided with a plurality of water outlet ends in the circumferential direction of the rotating wheel; the rotating wheel is constructed to rotate under the acting force of liquid sprayed out of the water outlet end of the water distribution pipe so as to drive the generator to generate electricity, the single-machine capacity of the impulse turbine is high, and therefore the arrangement of the hydroelectric generating set is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to an impulse turbine. Background Art

[0002] As an important part of power development, hydropower technology development has been widely deployed in areas with mountains and rivers. Among them, the Yarlung Zangbo Grand Bend area has the characteristics of high head and large flow. Among them, high head refers to the high sum of kinetic energy and potential energy of water. In this way, in order to make full use of the high water energy resources in the Grand Bend area, the area usually also has a large installed capacity, that is, the total capacity of the turbines installed in the hydropower station is large, and the total capacity includes the number of turbines and the sum of the rated capacity of each turbine.

[0003] In the related art, water turbines include mixed flow turbines and impulse turbines. The head height applicable to the former is limited. When it is used for hydroelectric power generation in high head areas, a three-stage layout is required, that is, three underground powerhouses are excavated in areas at different underground heights to set up mixed flow turbines. The manpower and material costs are high, and the power generation efficiency is low. In other related technologies, impulse turbines are used for hydroelectric power generation under high head conditions. The impulse turbine includes a nozzle and a runner bucket. The shaft on the runner is connected to a generator. When working, high head water flows through the nozzle into the runner bucket, driving the runner to rotate to provide power for the generator.

[0004] However, the single-unit capacity of the impulse turbine in the related technology is relatively small, and it is usually necessary to install multiple impulse turbines, that is, to increase the generator set. Correspondingly, the construction area of ​​the underground plant also needs to be expanded, which is costly and takes a long time for infrastructure construction. Utility Model Content

[0005] The utility model provides an impulse turbine, which is used to improve the single unit capacity of the impulse turbine and simplify the arrangement of the entire hydroelectric generating set to meet the hydropower development requirements of the Yarlung Zangbo River Great Bend area.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides an impulse turbine, which is applied to a reservoir. The impulse turbine comprises:

[0008] a housing having an inner cavity;

[0009] A runner assembly is arranged in the inner cavity, the runner assembly comprises a main shaft and a plurality of runners sleeved on the outer periphery of the main shaft, the main shaft is used to be connected to a generator, and the plurality of runners are arranged at intervals along the axial direction of the main shaft;

[0010] A water distribution assembly, comprising a plurality of water distribution pipes arranged corresponding to the runner, wherein a first end of the water distribution pipe is connected to a water supply end, a second end of the water distribution pipe is located in the inner cavity and is arranged around the outer side of the runner, and the water distribution pipe has a plurality of water outlet ends along the circumference of the runner;

[0011] The runner is configured to rotate under the force of the liquid sprayed from the water outlet end of the water distribution pipe to drive the generator to generate electricity.

[0012] In a possible implementation, the plurality of water outlet ends of the water distribution pipe are distributed at equal intervals along the circumference of the runner, and nozzles are mounted on the water outlet ends, with nozzle openings of the nozzles facing the runner.

[0013] In a possible implementation, a deflector is movably connected to the nozzle, the deflector has a water outlet, and the deflector is configured to deflect the water flow sprayed from the nozzle to the water outlet.

[0014] In a possible implementation, the nozzle includes a nozzle pipe connected to the water outlet end and a nozzle throat located at one end of the nozzle pipe facing the impeller, the nozzle throat has the nozzle opening, and the deflector is hinged to the side wall of the nozzle pipe.

[0015] In a possible implementation, the water distribution assembly further includes a reflective plate, which is disposed on the side of the nozzle and fixed relative to the nozzle.

[0016] In a possible implementation, the reflective plate is an arc-shaped plate, the concave surface of the arc-shaped plate faces the water outlet of the deflector, and is used to reflect the water flow refracted by the deflector toward the bottom of the shell.

[0017] In a possible implementation, baffles are connected to both sides of the reflective plate to form a reflective cavity.

[0018] In a possible implementation, the water distribution assembly further includes a bracket, and the reflector is connected to the wall of the nozzle pipe through the bracket.

[0019] In a possible implementation, it also includes a next-door branch pipe, the diameter of which gradually decreases along its own axial direction, the first end of the next-door branch pipe is connected to the water supply end, and the second end of the next-door branch pipe has a plurality of branch pipelines arranged along the axial direction of the main axis, and is connected to the water distribution pipe one by one.

[0020] In a possible implementation, the bottom of the shell is connected to a tail water collection device.

[0021] The impulse turbine provided by the embodiment of the utility model has at least the following beneficial effects:

[0022] Compared with the single-runner turbine in the related technology, the structure of the turbine is optimized. Three runners are connected by a main shaft and placed in a shell. The shell is the runner chamber. Each runner is correspondingly provided with a surrounding water distribution pipe. The three-layer water distribution pipe is connected to the next-door branch pipe which is divided into three. There are multiple evenly distributed nozzles on the water distribution pipe. The nozzles are located in the inner cavity of the shell and point to the runner, and are spaced apart from the runner. In this way, the above structure increases the single-unit capacity of the Pelton turbine, and the manufacturing layout of the turbine is simple and the operating stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of an impulse turbine provided by an embodiment of the utility model;

[0025] Figure 2 A schematic structural diagram of a nozzle of an impulse turbine provided in an embodiment of the utility model;

[0026] Figure 3 A three-dimensional structural schematic diagram of an impulse turbine provided by an embodiment of the utility model is provided;

[0027] Figure 4 The present invention is intended to illustrate a three-dimensional structural schematic diagram of a water distribution assembly of an impulse turbine provided in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 100-housing;

[0030] 200-rotor assembly;

[0031] 210-spindle; 220-rotor;

[0032] 300-water distribution assembly;

[0033] 310- water distribution pipe; 320- nozzle; 330- deflector;

[0034] 340-reflector; 350-bracket;

[0035] 400-next-door branch pipe;

[0036] 500- Tail water collection device;

[0037] 600-Generator. DETAILED DESCRIPTION

[0038] As described in the background technology, the Yarlung Zangbo River Great Bend area has the characteristics of high head and large flow, which requires a large installed capacity turbine for power generation. In the relevant technology, the turbine includes a mixed flow turbine and an impulse turbine. The head height applicable to the former is limited. When it is used for hydropower generation in high head areas, a three-stage segmented process is required, that is, three underground powerhouses are excavated in areas at different underground heights to set up the mixed flow turbine. The manpower and material costs are high, and the power generation efficiency is low; in other related technologies, an impulse turbine is used for hydropower generation under high head conditions. The impulse turbine includes a nozzle and a runner bucket. The rotating shaft on the runner is connected to a generator. When working, high head water flows through the nozzle into the runner bucket, driving the runner to rotate to provide power generation power for the generator. There are problems such as small single unit capacity of the impulse turbine and the need to build a large-area plant, which is costly.

[0039] After research by the applicant, it was found that the reason for the above problems is that the mixed flow turbine generally has a large unit capacity, but the applicable head is limited, and the maximum does not exceed 800m. High head impulse turbines are often used, but the traditional bucket turbine has a small unit capacity. The 1883m bucket turbine with the highest head in the world currently has a unit capacity of only 400,000 kW; in the relevant technology, the impulse turbine is a single-runner turbine, which is mainly used in generator sets with high head and small flow. The impulse turbine has a nozzle and a runner. The working process of the single-runner turbine includes: high-head water flow enters from the water diversion pipe and is injected into the runner bucket through the nozzle. The fluid energy is converted into mechanical energy by the runner and the shaft and transmitted to the generator rotor and then converted into electrical energy. The water flow after work flows out from the runner to the downstream of atmospheric pressure, but the structure of the single runner makes the unit capacity of the turbine low, which cannot meet the application of the large bend area.

[0040] In view of the above technical problems, an embodiment of the utility model provides an impulse turbine with a simple structure and easy manufacturing. Through the design of three impellers connected coaxially in series, a large-capacity bucket-type turbine structure is realized. The capacity of a single unit is large, which simplifies the layout of the unit compared with the multi-stage plant and multiple unit settings required for the single-impedance turbine structure in the related art.

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] In order to make the above-mentioned purposes, features and advantages of the embodiments of the utility model more obvious and easy to understand, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0043] Combination Figure 1 The structure diagram of the impulse turbine shown in the figure, the embodiment of the utility model provides an impulse turbine, which is applied to a reservoir, and the impulse turbine includes:

[0044] The housing 100 has an inner cavity. It can be understood that the housing 100 is the runner 220 chamber of the turbine; the runner assembly 200 is arranged in the inner cavity. The runner assembly 200 includes a main shaft 210 and a plurality of runners 220 sleeved on the outer periphery of the main shaft 210. The main shaft 210 is used to connect with the generator 600. The plurality of runners 220 are arranged at intervals along the axial direction of the main shaft 210. For example, the main shaft 210 located in the inner cavity is sleeved with three runners 220 along the axial direction; the water distribution assembly 300 includes and A plurality of water distribution pipes 310 are arranged corresponding to the impeller 220, and the first end of the water distribution pipe 310 is connected to the water supply end. For example, the water supply end is a reservoir, and the first end of the water distribution pipe 310 is connected to the reservoir through a water inlet pipe. The second end of the water distribution pipe 310 is located in the inner cavity and is arranged around the outside of the impeller 220. The water distribution pipe 310 has a plurality of water outlet ends along the circumference of the impeller 220; the impeller 220 is constructed to rotate under the action of the liquid sprayed from the water outlet end of the water distribution pipe 310 to drive the generator 600 to generate electricity.

[0045] In this way, pressurized water flow is introduced through the water supply end and then sprayed into the impeller 220 through the water distribution pipe 310 and the nozzle 320 thereon to perform work. The impeller 220 drives the main shaft 210 to rotate and is converted into mechanical energy for the generator 600 to generate electricity, thereby realizing efficient hydroelectric power generation. In this embodiment, the three-layer impeller 220 is evenly installed on the same main shaft 210, and the number of impellers 220 installed on the main shaft 210 can also be adjusted according to the working power of the turbine to achieve a balance between the rated power and the maximum working efficiency of the turbine unit. Since the three-layer impeller 220 is in the same inner cavity of the shell 100, the layout and height of the plant can be simplified, and the construction cost of the hydropower station can be reduced.

[0046] By arranging a plurality of runners 220 on the main shaft 210, the flow capacity and mechanical energy output power capacity of the turbine are greatly improved, which is conducive to the large-scale unit.

[0047] Furthermore, the impeller 220 is a bucket-type impeller 220, which can fully utilize the energy of water flow, is particularly suitable for hydropower generation scenarios with large changes in water flow, and can adapt to the hydropower generation environment in high head areas of mountains and rivers.

[0048] In some embodiments, the water inlet pipe is a three-layered bifurcated pipe 400, which is connected to the reservoir to introduce water into the turbine. The water distribution pipe 310 is a water distribution ring pipe. Each layer of the bifurcated pipe 400 is connected to the water distribution ring pipe. The water distribution ring pipe is arranged corresponding to the impeller 220, that is, the height of the water distribution ring pipe is adapted to the impeller 220, and the number of nozzles 320 on each layer of the water distribution ring pipe is controlled according to the hydropower generation power demand.

[0049] It can be understood that the next-door branch pipe can also be called a water diversion branch pipe. The water diversion branch pipe allows the main water flow to be diverted to different directions to supply multiple impellers in the turbine. It not only helps to flexibly adjust the system's water energy utilization to adapt to different load requirements, but also as the river water level or water flow changes, the working conditions of the turbine may need to be adjusted. The water diversion branch pipe can be used to cope with these changes and ensure that each impeller of the turbine can operate at a better working point. The water diversion branch pipe increases the operating flexibility of the turbine, enabling it to adapt to changing water energy resources and electricity demands.

[0050] As a possible implementation manner, multiple water outlet ends of the water distribution pipe 310 are evenly spaced along the circumference of the impeller 220, and a nozzle 320 is installed on the water outlet end, and the nozzle mouth of the nozzle 320 faces the impeller 220, that is, multiple nozzles 320 are circumferentially distributed on the water distribution pipe 310 surrounding the impeller 220 and facing one side of the impeller 220, so that water can be evenly sprayed on the impeller 220, thereby ensuring the rotation stability of the impeller 220.

[0051] Based on the above embodiment, it can be improved that reference Figure 2 The nozzle 320 is movably connected with a deflector 330, which has a water outlet. The deflector 330 is constructed to refract the water flow ejected from the nozzle to the water outlet. In this way, the direction of the water flow ejected from the nozzle 320 can be adjusted, and the impact force when the water flow is ejected to the turbine runner 220 can be reduced, which helps to reduce the wear of the turbine parts and improve the life of the equipment. At the same time, the design of the deflector 330 helps to reduce the loss of water flow between the nozzle 320 and the runner 220. By optimizing the path of the water flow, energy loss can be reduced and the efficiency of the turbine can be improved. Further, by controlling the direction of the water flow, the deflector 330 can help improve the operating stability of the turbine and ensure good performance under different working conditions.

[0052] Furthermore, the nozzle 320 includes a nozzle pipe connected to the water outlet and a nozzle throat located at the end of the nozzle pipe facing the runner 220, the nozzle throat has a nozzle opening, and the deflector 330 is hinged to the side wall of the nozzle pipe, so that the deflector 330 can be adjusted by being hinged to the side wall of the nozzle pipe. This allows the operator to flexibly adjust the angle of the deflector 330, thereby changing the direction and intensity of the water flow. Such an adjustment capability helps to adapt to different water flow conditions and load requirements and improve the applicability of the turbine; the design of the nozzle 320 not only affects the guidance of the water flow, but also affects the output power and efficiency of the turbine, so that it can obtain better performance under different working conditions. Through reasonable water flow orientation and adjustment of the deflector 330, the impact of the turbine on the equipment can be reduced, the blade wear can be reduced, and the life of the equipment can be extended.

[0053] In some embodiments, the water distribution assembly 300 also includes a reflective plate 340, which is disposed on the side of the nozzle 320 and fixed relative to the nozzle 320. When the turbine is unloaded, the deflector 330 is adjusted to be blocked in front of the nozzle 320, and the water is ejected from the outlet of the deflector 330 to the reflective plate 340. The reflective plate 340 can be used to reflect the water to the bottom of the shell 100 to thereby guide the water out, thereby preventing high-pressure water from damaging the inner cavity of the shell 100 or the structure of the impeller assembly 200.

[0054] On the basis of the above embodiment, it can be improved by further combining Figure 3 and Figure 4 The reflecting plate 340 is an arc-shaped plate, and the concave surface of the arc-shaped plate faces the water outlet of the deflector 330, which is used to reflect the water flow refracted by the deflector 330 toward the bottom of the shell 100 to improve the ability of reflecting water.

[0055] As a possible implementation manner, baffles are connected to both sides of the reflective plate 340 to form a reflective cavity to increase the reflective area of ​​the reflective water body.

[0056] In some embodiments, the water distribution assembly 300 also includes a bracket 350, and the reflective plate 340 is connected to the pipe wall of the nozzle pipe through the bracket 350. In other examples, the reflective plate 340 is connected to the pipe wall of the water distribution pipe 310 close to the nozzle 320 through the bracket 350 to facilitate the installation of the reflective plate 340.

[0057] In other possible embodiments, the impulse turbine also includes a next-door fork pipe 400, the diameter of which gradually decreases along its own axial direction, the first end of the next-door fork pipe 400 is connected to the water supply end, and the second end of the next-door fork pipe 400 has a plurality of branch pipes arranged along the axial direction of the main shaft 210, and is connected to the water distribution pipe 310 one-to-one, that is, a next-door fork pipe 400 is used to divide a main pipe into three branch pipes, and the diameters of the three branch pipes are the same.

[0058] On the basis of the above-mentioned embodiment, it can be improved that the bottom of the shell 100 is connected to a tailwater collecting device 500. Exemplarily, the tailwater collecting device 500 is a tailwater pool. In this way, the water flow hitting the impeller 220 can flow to the tailwater pool by gravity. In this way, in the hydroelectric power generation system including the impulse turbine provided in the embodiment of the utility model, it plays a role in regulating the flow of tailwater, buffering environmental impact and reusing water energy, which contributes to the smooth operation of the hydroelectric power station and the sustainable management of the environment.

[0059] It should be noted that when the unit is unloaded, that is, when the turbine is affected by an emergency and quickly reduces its speed or stops rotating to generate electricity, the deflector 330 works, and the water flow is deflected by the deflector 330, and the water flow hits the reflector 340 bent at a certain angle, so that the water flow hits the tailwater pool vertically, and each layer does not interfere with each other. A needle valve is provided at the end of the nozzle 320, which is used to adjust the load of the turbine, and adjust the output power of the turbine by controlling the amount and speed of the water flow. The needle valve at the nozzle 320 has a synergistic effect with the nozzle 320. The nozzle 320 is used to guide water to the turbine runner 220, and the needle valve controls the opening degree of the nozzle 320, affecting the strength of the water flow. The coordinated design of the deflector 330 and the reflector 340 in the embodiment of the utility model can also reduce the working pressure of the needle valve and extend the energy dissipation time.

[0060] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0065] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An impulse turbine, characterized in that: Applied to a reservoir, the impulse turbine comprises: a housing having an inner cavity; A runner assembly is arranged in the inner cavity, the runner assembly comprises a main shaft and a plurality of runners sleeved on the outer periphery of the main shaft, the main shaft is used to be connected to a generator, and the plurality of runners are arranged at intervals along the axial direction of the main shaft; A water distribution assembly, comprising a plurality of water distribution pipes arranged corresponding to the runner, wherein a first end of the water distribution pipe is connected to a water supply end, a second end of the water distribution pipe is located in the inner cavity and is arranged around the outer side of the runner, and the water distribution pipe has a plurality of water outlet ends along the circumference of the runner; The runner is configured to rotate under the force of the liquid sprayed from the water outlet end of the water distribution pipe to drive the generator to generate electricity.

2. The impulse turbine according to claim 1, characterized in that: The plurality of water outlet ends of the water distribution pipe are distributed at equal intervals along the circumference of the runner, and nozzles are mounted on the water outlet ends, with the nozzle openings of the nozzles facing the runner.

3. The impulse turbine according to claim 2, characterized in that: The nozzle is movably connected with a deflector, which has a water outlet. The deflector is configured to deflect the water flow sprayed from the nozzle to the water outlet.

4. The impulse turbine according to claim 3, characterized in that: The nozzle comprises a nozzle pipe connected to the water outlet end and a nozzle throat located at one end of the nozzle pipe facing the runner, the nozzle throat has the nozzle opening, and the deflector is hinged to the side wall of the nozzle pipe.

5. The impulse turbine according to claim 3, characterized in that: The water distribution assembly also includes a reflector plate, which is arranged on the side of the nozzle and fixed relative to the nozzle.

6. The impulse turbine according to claim 5, characterized in that: The reflective plate is an arc-shaped plate, the concave surface of which faces the water outlet of the deflector, and is used to reflect the water flow refracted by the deflector toward the bottom of the shell.

7. The impulse turbine according to claim 5, characterized in that: Baffles are connected to both sides of the reflective plate to form a reflective cavity.

8. The impulse turbine according to claim 5, characterized in that: The water distribution assembly also includes a bracket, and the reflection plate is connected to the pipe wall of the nozzle pipe through the bracket.

9. The impulse turbine according to any one of claims 1 to 8, characterized in that: It also includes a next-door branch pipe, the diameter of which gradually decreases along its own axial direction, the first end of which is connected to the water supply end, and the second end of which has a plurality of branch pipes arranged along the axial direction of the main axis, and is connected to the water distribution pipe one by one.

10. The impulse turbine according to any one of claims 1 to 8, characterized in that: The bottom of the shell is connected to a tail water collecting device.

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